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xxMikexx [17]
4 years ago
15

The pair of points is on the graph of an inverse variation. find the missing value. (5,4) and (x,7)

Mathematics
2 answers:
d1i1m1o1n [39]4 years ago
7 0
One form of the relation of inverse variation is y = k/x.

first step:  Find the value of k:    Taking the values x=5 and y = 4, 4=k/5, or k=20.  Then,   y = 20/x.

Next:  Let y = 7 and find the corresp. value of x:  7=20/x, or 7x=20, or

x = 20/7    (answer) 
wel4 years ago
6 0
To the risk of sounding redundant.

\bf \qquad \qquad \textit{inverse proportional variation}
\\\\
\textit{\underline{y} varies inversely with \underline{x}}\qquad \qquad  y=\cfrac{k}{x}\impliedby 
\begin{array}{llll}
k=constant\ of\\
\qquad  variation
\end{array}\\\\
-------------------------------

\bf (5,4)\textit{ we also know that }
\begin{cases}
x=5\\
y=4
\end{cases}\implies 4=\cfrac{k}{5}\implies 20=k
\\\\\\
therefore\qquad \boxed{y=\cfrac{20}{x}}
\\\\\\
(x,7)\textit{ when y = 7, what is \underline{x}?}\qquad 7=\cfrac{20}{x}\implies x=\cfrac{20}{7}\implies x=2\frac{6}{7}
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3 years ago
Simpifly (-5x2 - 3x - 7) + (-2x3 + 6x2 - 8)
ioda

Answer:

-2x³ + x² - 3x - 15

Step-by-step explanation:

Simply combine like terms together:

-5x² - 3x - 7 - 2x³ + 6x² - 8

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3 years ago
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Tanzania [10]

Answers:

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6 0
3 years ago
Help me this is really hard
nirvana33 [79]
1. 2n > 17

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2. n/5 ≥ 11

n ≥ 55

3. -3y ≤ -18

y ≥ 6

If these are right, please leave a thanks and a rating.
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3 years ago
8. Which number below is the least?
il63 [147K]

Answer: C

Step-by-step explanation:

Simplified: -1.4, -0.25, -0.2, 0

I hope this helps

             ~Princess <3

7 0
3 years ago
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